Jenna Bush, daughter of President Bush, sticks her tongue out at the media in 2004.

Jenna Bush, daughter of President Bush, sticks her tongue out at the media in 2004.

Photo: STEPHANIE S.CORDLE, AP

Jenna Bush, daughter of President Bush, sticks her tongue out at...photo-1366873.23069 - |ucfirst

President George W. Bush was himself the sometimes misbehaving child of a president. He is seen here in 1999 with from left to right, Neil Bush, former President George Bush, Jeb Bush, Marvin Bush and Dorothy Koch. Standing, from left to right, is Sharon Bush, Laura Bush, former first lady Barbara Bush, Columba Bush, Margaret Bush and Bobby Koch. less

President George W. Bush was himself the sometimes misbehaving child of a president. He is seen here in 1999 with from left to right, Neil Bush, former President George Bush, Jeb Bush, Marvin Bush and Dorothy ... more

Photo: DAVID J. PHILLIP, AP

President George W. Bush was himself the sometimes misbehaving...photo-1366874.23069 - |ucfirst

Chelsea Clinton was escorted by secret service agents to her high school graduation ceremonies in 1997. When it comes to presidential children the service walks a fine line between friendly and firm.

Chelsea Clinton was escorted by secret service agents to her high school graduation ceremonies in 1997. When it comes to presidential children the service walks a fine line between friendly and firm.

Photo: WILFREDO LEE, AP

Chelsea Clinton was escorted by secret service agents to her high...photo-1366875.23069 - |ucfirst

Chelsea Clinton introduces her mother, Sen. Hillary Clinton, to the delegates at the Democratic National Convention in 2008. Chelsea accompanied her mother on many stops during Hillary Clinton’s campaign for president. less

Chelsea Clinton introduces her mother, Sen. Hillary Clinton, to the delegates at the Democratic National Convention in 2008. Chelsea accompanied her mother on many stops during Hillary Clinton’s campaign ... more

Amy Carter sits on President Carter's lap in his private study at the White House.

Amy Carter sits on President Carter's lap in his private study at the White House.

Photo: Jeff Carter, White House HO

Amy Carter sits on President Carter's lap in his private study...photo-1366879.23069 - |ucfirst

Amy Carter, raises her fist in victory after she, and 14 other co-defendants were found not guilty on charges of trespassing and disorderly conduct during a 1986 demonstration at the University of Massachusetts campus in Amherst, Mass., in protest against the CIA recruiting on campus. less

Amy Carter, raises her fist in victory after she, and 14 other co-defendants were found not guilty on charges of trespassing and disorderly conduct during a 1986 demonstration at the University of Massachusetts ... more

President Gerald Ford, center, his wife, Betty Ford, third from left and their children Michael Gerald, John Gardner, Steven Meigs, and Susan Elizabeth in a family photo taken at the White House in 1975.

President Gerald Ford, center, his wife, Betty Ford, third from left and their children Michael Gerald, John Gardner, Steven Meigs, and Susan Elizabeth in a family photo taken at the White House in 1975.

Then three-year-old John F. Kennedy Jr. salutes his father's casket outside St. Matthews Cathedral following funeral mass in 1963, three days after the president was assassinated in Dallas. Widow Jacqueline Kennedy, center, and daughter Caroline Kennedy are accompanied by the late president's brothers Edward Kennedy, left, and Robert Kennedy. less

Then three-year-old John F. Kennedy Jr. salutes his father's casket outside St. Matthews Cathedral following funeral mass in 1963, three days after the president was assassinated in Dallas. Widow Jacqueline ... more

John F. Kennedy Jr., seen here in a commemorative issue of Time magazine, died after a plane crash in 1999 along with his wife and sister-in-law.

John F. Kennedy Jr., seen here in a commemorative issue of Time magazine, died after a plane crash in 1999 along with his wife and sister-in-law.

Photo: AP

John F. Kennedy Jr., seen here in a commemorative issue of Time...photo-1366885.23069 - |ucfirst

Caroline Kennedy’s name surfaced as a possible replacement for Sen. Hillary Rodham Clinton in early December after President Barack Obama nominated Clinton to be secretary of state. Kennedy is seen here in an interview in Dec. 2008. less

Caroline Kennedy’s name surfaced as a possible replacement for Sen. Hillary Rodham Clinton in early December after President Barack Obama nominated Clinton to be secretary of state. Kennedy is seen here ... more

Photo: Stephen Chernin, AP

Caroline Kennedy&#x2019;s name surfaced as a possible...photo-1366886.23069 - |ucfirst